A small fetal septum is not necessarily a problem. The growth and development of each fetus is different, so the symptoms and manifestations are also different. If there is only a simple small fetal septum pellucidum, it may be a normal situation, and does not mean that the structure of the fetal brain is abnormal, as long as other development of the fetus is normal, generally there is no need to be overly nervous. If there is not only a small fetal septum pellucidum, but also abnormal development of corpus callosum, missing corpus callosum, etc., it is considered to be problematic, it is best to actively seek medical treatment, and should be further nuclear magnetic, to understand the other intracranial structures, in order to avoid the impact on the late development of the fetus. It is recommended that pregnant women should not worry too much, and timely prenatal diagnostic examination to clarify.